EPE网套包装皇冠梨的静力学特性及损伤研究

Static Characteristics and Damage of Huangguan Pears Packaged with EPE Net

中文关键词: EPE网套  皇冠梨  准静态压缩实验  有限元模拟  静力学特性  损伤

英文关键词: EPE net  Huangguan Pears  quasi-static compression experiments  finite element simulation  static characteristics  damage

中文摘要:

      目的 模拟皇冠梨在物流运输中受静压情况，研究发泡聚乙烯(Expandable Polyethylene，EPE)网套包装皇冠梨在横向、纵向及斜向上的静压力学特性及损伤。方法 主要采用皇冠梨准静态压缩试验和有限元分析法。结果 横向、纵向及斜向仿真与试验的结果相对误差分别为1.21%、5.49%和5.55%，验证了有限元模型的准确性。与皇冠梨裸果相比，在横向、纵向及斜向静压下，EPE网套包装皇冠梨出现初始损伤的位移分别提高了3.5倍、2.9倍和2.3倍;压缩位移为15 mm时，EPE网套包装皇冠梨承受的静压力分别减小了76.1%、74.4%和51.0%;梨果压缩至破裂时，EPE网套包装皇冠梨承受的静压力分别提高了17.9%、14.9%和21.5%，抵抗外界变形量分别提高了1.9倍、1.8倍和1.7倍。EPE网套包装皇冠梨损伤面积和体积百分比均保持在5%以下。结论 EPE网套包装对静压下皇冠梨的缓冲效果明显，提高了其静压承载力，减小了静压损伤，可为皇冠梨缓冲包装设计及采收减损提供一定的参考。

英文摘要:

      The work aims to simulate the static pressure conditions of Huangguan Pears during logistics transportation and investigate the static mechanical properties and damage of Huangguan Pears packaged with Expandable Polyethylene (EPE) net in the transverse, longitudinal, and oblique directions. The methods adopted mainly included quasi-static compression experiments on Huangguan Pears and finite element analysis. The relative errors between the simulated and experimental results in the transverse, longitudinal, and oblique directions were 1.21%, 5.49%, and 5.55%, respectively, validating the accuracy of the finite element model. Compared to unpackaged Huangguan Pears, under transverse, longitudinal, and oblique static pressure, the initial displacement at which EPE-packaged Huangguan Pears experienced initial damage increased by 3.5 times, 2.9 times, and 2.3 times, respectively. At a compression displacement of 15 mm, the static pressure borne by EPE-packaged Huangguan Pears decreased by 76.1%, 74.4%, and 51.0%, respectively. When Huangguan Pears were compressed to the point of rupture, the static pressure borne by EPE-packaged Huangguan Pears increased by 17.9%, 14.9%, and 21.5%, respectively, and the resistance to external deformation increased by 1.9 times, 1.8 times, and 1.7 times. The damage area and volume percentages for EPE-packaged Huangguan Pears remained below 5%. The EPE net demonstrates a significant cushioning effect under static pressure, enhancing its static pressure-bearing capacity, reducing static pressure damage, and providing valuable insights for the design of cushioning packaging for Huangguan Pears, as well as minimizing losses during harvesting.